#include <iostream>
using std::cout;
using std::endl;

int num = 200;

void display(){
    cout << "cpp no.1" << endl;
}

static int num2 = 1;

namespace wd
{
int num = 2000;

void display(){
    cout << "cpp no.2" << endl;
}
}

namespace 
{
int num3 = 1000;
}


